Measurements of erythemal energy

With the the growing popularity of solaria and increasing public acceptance of sources generating erythemal ultraviolet, there is a definite need in the field for a rugged, compact direct-reading meter that will measure the E-Vitons per square foot in the same way that a footcandle meter measures lumens/square foot. E-Vitons are the unit to express the health and erythema value of radiations above 2,800 Angstrom units. The design of such a meter is discussed.